Display Apparatus Assembly

1. A display apparatus assembly comprising: a display apparatus; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the display apparatus includes an eye glasses-type frame that is mountable on a head of an observer and two image displaying devices mounted in the frame, the image displaying devices generating a virtual image for left and right eyes of the observer, respectively, each of the image displaying devices includes (a) a virtual image forming device (b) an optical system that propagates light output from the corresponding virtual image forming device as parallel light, and (c) an optical device comprising an observer-transparent light guiding plate to which the parallel light output from the optical system is incident on a first surface of the light guiding plate and in which the light is guided so as to be output from the first surface of the light guiding plate to the respective eye of the observer while enabling the observer to view the real space image, the light guiding plate being in a line of vision of the respective eye, the observer being able to see a real space image through the light guide plate, the real space image being a real-world image or scene, the virtual image and the real space image are able to be viewed simultaneously via the light guiding plates, and the controller is configured to change a convergence angle of the virtual image displayed by the display apparatus by relatively moving an optical axis of each image forming device and an optical axis of the corresponding optical system in a horizontal direction based on the speed of the display apparatus as measured by the speed measuring device.

2. The display apparatus assembly according to claim 1 , wherein the convergence angle is changed by controlling image signals input to the image forming devices that configure at least one of the image displaying devices.

3. The display apparatus assembly according to claim 1 , wherein: at least one of the image displaying devices further includes a movement device that relatively moves an optical axis of the corresponding image forming device and an optical axis of the corresponding optical system in the horizontal direction, and the convergence angle is changed via the movement device.

4. The display apparatus assembly according to claim 1 , wherein: at least one of the image displaying devices further includes a rotary movement device that rotates the corresponding image forming device and the corresponding optical system, and the convergence angle is changed by rotating the image forming device and the optical system by using the rotary movement device so as to change an incidence angle of the parallel light that is output from the optical system and is incident to the optical device with respect to the optical device.

5. The display apparatus assembly according to claim 1 , wherein: the optical system of at least one of the image displaying devices includes a liquid lens, and the convergence angle is changed by operating the liquid lens.

6. The display apparatus assembly according to claim 1 , wherein: the optical system of at least one of the image displaying devices includes a liquid prism, and the convergence angle is changed by operating the liquid prism.

7. The display apparatus assembly according to claim 1 , wherein the speed measuring device comprises a global positioning system and a calculation device that determines the speed based on data supplied thereto by the global positioning system.

8. The display apparatus assembly according to claim 1 , wherein the speed measuring device comprises a speed/acceleration sensor and a calculation device that determines the-speed based on data supplied thereto by the speed/acceleration sensor.

9. The display apparatus assembly according to claim 1 , wherein the speed measuring device comprises a wheel rotation detecting device and a calculation device that determines the speed based on data supplied thereto by the wheel rotation number detecting device.

10. The display apparatus assembly according to claim 1 , wherein the optical device is a semi-transmissive type.

11. A display apparatus assembly comprising: a display apparatus; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the display apparatus includes an eye glasses-type frame that is mountable on a head of an observer and an image displaying device that is mounted in the eye glasses-type frame, the image displaying device generating a virtual image for an eye of the observer, the image displaying device includes (a) a virtual image forming device (b) an optical system that propagates light output from the image forming device as parallel light, and (c) an optical device comprising an observer-transparent light guiding plate to which the parallel light output from the optical system is incident on a first surface of the light guiding plate and in which the light is guided so as to be output from the first surface of the light guiding plate to the eye of the observer while enabling the observer to view the real space image, the light guiding plate being in a line of vision of the eye, the observer being able to see a real space image through the light guide plate, the real space image being a real-world image or scene, the virtual image and the real space image are able to be viewed simultaneously via the light guiding plate, and the controller is configured to change a virtual-image distance of the virtual image displayed by the image displaying device by changing a focal distance of the optical system based on the speed of the display apparatus as measured by the speed measuring device.

12. The display apparatus assembly according to claim 11 , wherein: the optical system of the image displaying device includes a liquid lens, and the focal distance of the optical system is changed by operating the liquid lens.

13. A display apparatus assembly comprising: a display apparatus; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the display apparatus includes an eye glasses-type frame that is mountable on a head of an observer and an image displaying device that is mounted in the eye glasses-type frame, the image displaying device generating a virtual image for an eye of the observer, the image displaying device includes (a) a virtual image forming device, (b) an optical system that propagates light output from the image forming device as parallel light, and (c) an optical device comprising an observer-transparent light guiding plate to which the parallel light output from the optical system is incident on a first surface of the light guiding plate and in which the light is guided so as to be output from the first surface of the light guiding plate to an eye of the observer while enabling the observer to view the real space image, the light guiding plate being in a line of vision of the eye, the observer being able to see a real space image through the light guide plate, the real space image being a real-world image or scene, the virtual image and the real space image are able to be viewed simultaneously via the light guiding plate, and the controller is configured to a luminance of the virtual image or a resolution of the virtual image based on the speed of the display apparatus as measured by the speed measuring device.

14. A display apparatus assembly comprising: a display apparatus; a controller; and a acceleration measuring device that measures acceleration of the display apparatus during a movement of the display apparatus, wherein, the display apparatus includes an eye glasses-type frame that is mountable on a head of an observer and an image displaying device that is mounted in the frame, the image displaying device generating a virtual image for an eye of the observer, the image displaying device includes (a) a virtual image forming device, (b) an optical system that propagates light output from the image forming device as parallel light, and (c) an optical device comprising an observer-transparent light guiding plate to which the parallel light output from the optical system is incident on a first surface of the light guiding plate and in which the light is guided so as to be output from the first surface of the light guiding plate to the eye of the observer while enabling the observer to view a real space image through the light guiding plate, the light guiding plate being in a line of vision of the eye, the real space image being a real-world image or scene, the virtual image and the real space image are able to be viewed simultaneously via the light guiding plate, and the controller stops an operation of the image displaying device when an absolute value of the acceleration of the display apparatus during the movement of the display apparatus as measured by the acceleration measuring device is equal to or greater than a predetermined value.

15. The display apparatus assembly according to claim 14 , wherein the acceleration measuring device comprises a global positioning system and a calculation device that determines the acceleration based on data supplied thereto by the global positioning system.

16. The display apparatus assembly according to claim 14 , wherein the acceleration measuring device comprises an acceleration sensor and a calculation device that determines the acceleration based on data supplied thereto by the acceleration sensor.

17. The display apparatus assembly according to claim 14 , wherein the-acceleration measuring device comprises a wheel rotation detecting device and a calculation device that determines the acceleration of the display apparatus based on data supplied thereto by the wheel rotation number detecting device.

18. A head-mounted display comprising: a frame with a head-mounted display that is mountable on a head of an observer; a display apparatus that generates a virtual image incident on a first surface of an observer-transparent light guiding plate to be guided and output from the first surface of the light guiding plate to an eye of an observer while enabling the observer to view a real space image through the light guiding plate, the real space image being a real-world image or scene, the light guiding plate being in a line of vision of the eye; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the controller changes a convergence angle of the virtual image displayed by the display apparatus by relatively moving an optical axis of the image forming device and an optical axis of the corresponding optical system in a horizontal direction to minimize focal point differences between a real space image and the virtual image based on the speed of the display apparatus as measured by the speed measuring device, and the virtual image and the real space image are able to be viewed simultaneously via the light guiding plate.

19. A head-mounted display comprising: a frame with a head-mounted display that is mountable on a head of an observer; a display apparatus that projects a virtual image incident on a first surface of an observer-transparent light guiding plate to be guided and output from the first surface of the light guiding plate to the eye of an observer while enabling the observer to view a real space image through the light guiding plate, the real space image being a real-world image or scene, the light guiding plate being in a line of vision of the eye; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the controller is configured to change a focal distance of the display apparatus to minimize focal point differences between a real space image and the virtual image based on the speed of the display apparatus as measured by the speed measuring device, and the virtual image and the real space image are able to be viewed simultaneously via the light guiding plate.

20. A head-mounted display comprising: a frame with a head-mounted display that is mountable on a head of an observer; a display apparatus that projects a virtual image incident on a first surface of an observer-transparent light guiding plate to be guided and output from the first surface of the light guiding plate to an eye of an observer while enabling the observer to view a real space image through the light guiding plate, the real space image being a real-world image or scene, the light guiding plate being in a line of vision of the eye; a controller; and a speed measuring device that measures a speed of the display apparatus, wherein, the controller is configured to change a luminance of the virtual image or a resolution of the virtual image based on the speed of the display apparatus as measured by the speed measuring device, and the virtual image and real space image are able to be viewed simultaneously via the light guiding plate.